Reorganized installation docs

docs/installation/postgresql.md

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+NetBox requires a PostgreSQL database to store data. MySQL is not supported, as NetBox leverage's PostgreSQL's built-in [network address types](https://www.postgresql.org/docs/9.1/static/datatype-net-types.html).
+
+# Installation
+
+The following packages are needed to install PostgreSQL with Python support:
+
+* postgresql
+* libpq-dev
+* python-psycopg2
+
+```
+# sudo apt-get install -y postgresql libpq-dev python-psycopg2
+```
+
+# Configuration
+
+At a minimum, we need to create a database for NetBox and assign it a username and password for authentication. This is done with the following commands.
+
+!!! danger
+    DO NOT USE THE PASSWORD FROM THE EXAMPLE.
+
+```
+# sudo -u postgres psql
+psql (9.3.13)
+Type "help" for help.
+
+postgres=# CREATE DATABASE netbox;
+CREATE DATABASE
+postgres=# CREATE USER netbox WITH PASSWORD 'J5brHrAXFLQSif0K';
+CREATE ROLE
+postgres=# GRANT ALL PRIVILEGES ON DATABASE netbox TO netbox;
+GRANT
+postgres=# \q
+```
+
+You can verify that authentication works issuing the following command and providing the configured password:
+
+```
+# psql -U netbox -h localhost -W
+```
+
+If successful, you will enter a `postgres` prompt. Type `\q` to exit.